Which M15 X-ray Source Brightened?

Details Which M15 X-ray Source Brightened? Which M15 X-ray Source Brightened?

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006cxo..prop.2487h&link_type=abstract

Chandra Proposal ID #08408278

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Chandra Proposal Id #08408278

Scientific paper

We have recently discovered, in archival data, a very faint X-ray transient in M15 (2004 and 1994 outbursts at ~5e33 ergs/s), in addition to the two known bright LMXBs. We have just become aware that the RXTE ASM has recently (June-July) registered an outburst from M15 (=X2127+119), with countrates reaching 4 times normal. 3-4 smaller outbursts have been seen by RXTE, but this is the brightest yet seen. Both M15 persistent LMXBs show stable mass transfer. We suspect that the recent outburst may be due to a third source, possibly the newly identified transient, or perhaps another source. We request a short 10-ksec HRC-I observation of M15 sometime over the next 10 days to identify if another X-ray source, besides the two bright LMXBs, is responsible for the recent brightening of M15. This will give at least 5 counts from all sources with Lx(0.5-10)>2.6e32 ergs/s (for photon index 1.7).

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